Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dd35d9152c9d08…

MALICIOUS

PDF

82.3 KB Created: 2021-09-04 10:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 266516f6db59a956212fc5ed2c644f0a SHA-1: cba7c8c60c2ee6b51fc12ce879756fb0233a0014 SHA-256: a4dd35d9152c9d08d9663fb3cbceeca7d01e0c17cd86d225dd529f26a23c8d27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ankurgroups.com/userfiles/file/wevipenivuzezukopesa.pdf In PDF document text
    • https://jackinthegymtpe.com/uploads/files/202108271535301087.pdfIn PDF document text
    • http://polkovnik.su/upload/file/64241663432.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1dc0b31a4---xisezizuvupuwilemi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f156a0b3b---27956914378.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/fexupifit.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608074ab9dd30---5914062644.pdfIn PDF document text
    • http://355353.ru/userfiles/file/tibaminema.pdfIn PDF document text
    • https://ranagro.com/files/13397459828.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/nirixedowi.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/taxufesoleso.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e3db7d67---10009648169.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ieqdon2lks6v5qhptjv5va58kk/fulofo.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/kugamokusazozonumiku.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/lejivizoradugizirida.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/17f10584bbeb73f951dd8592fd3d0451/86154005513.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/91080904799.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/3670611346.pdfIn PDF document text
    • https://5uempat.com/contents/files/bukijonasosovaloki.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc7e54ec119---nomubebunimosomupojabikug.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e6a58f9e5---66842154227.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f0c90e631d00190eb3da126207604c03/77319733432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ncert+class+7+science+chapter+8+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA4 10832 bytes
SHA-256: 07029bbcc06fee2e6ebddbf0c260cf301189ca8b55d1a740037f6f2e27a5beb5
font_01_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 17112 bytes
SHA-256: 1df964dadd5884b2f479f56b505e30e717cfcdaf069a4efbeabef5f7a8810a2c
font_02_sfnt_off0001231e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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